Allah, glorified be His praise, says: "Take your adornment at every mosque (when attending the prayer)." [Surah al-A'raf: 31]
Imam al-Shafi'i (may Allah have mercy on him) says: "What is meant by it is garments, and Allah knows best, and this resembles what has been said."
The Shaykh (may Allah have mercy on him) says: "And this is the view of Tawus."
And Mujahid said: "(Adornment means) whatever covers your private parts, even if it is only a cloak ('aba'ah)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / Q3202